Four - Prezzi

Prezi is a non-linear presentation program. It consists of a single workspace where you can move, zoom, and rotate to show different ideas and how they connect to each other.

Three - Cacoo

Cacoo is a user friendly online drawing tool. It can be used to create diagrams collaboratively online, which can be exported to .png.

The free version limits the number of sheets and users that the diagrams can be shared with, and the premium version allows more export options, including pdf, ps, and svg.